Drill.



G. 0. LEOPOLD.

DRILL.

APPLIUATION HLBDBEPT. 11, 1913.

1 1 03,788. Patented Ju1y 14, 1914 Z SHEETS-EHEBT 1.

.//wwwwk THE NaRRls PEIERs Co., wAsHmnmN, D, c:v

G. O. LEOPOLD.

DRILL.

APPLICATION FILED SEPT. 11.y 1913.

Patented July 14, 1914.

2 SHEETS-SHEET 2.

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UNITED sTArEs PATENT Enron.

GEORGE o. LEOPOLD, OP PHILADELPHIA, PENNSYLVANIA, AssiGNOETo NORTH EEosiviro. oo., OP PHILADELPHIA, PENNSYLVANIA, n CORPORATION OEPENNSYLVANIA.

DRILL.

lSpecication of Letters Patent.

' Patented July 14, 1914.

To all 'whom 'it may concern Be it known that I, GEORGE O. LEoPoLD,.acitizen of the United States, residing 1n Philadelphia, Pennsylvania,have invented certain Improvements in Drills, of which the following isa specification.

The object of my invention is to provide a drill with automatic meansfor stopping longitudinal movement of the drill spindle when it reachesthe extreme upper or lower position, and this is accomplished withoutinterfering with the free rotation of the spindle.

In the accompanying drawings z-Figure 1, is a side view of the head of abench drill illustrating my invention and showing the shifter in themid-position; Fig. 2, is a front view with the shifter in the sameposition as in Fig. 1; Fig. 3, is a plan view; Fig. 4, is a sectionalplan view on the line L -a, Fig. l; Fig. 5, is a perspective view ofthepawl carrier; Fig. 6, is a perspective view of the pawl; Fig. 7, is adiagrammatic view showing the shifter in the feeding position anddescending; Fig. S, is a view showing the pawl being shifted by comingin contact with the abutment in the lower position; and Fig. 9, is aview showing theipawl coming in contact with the abutment when in theupper position.

Referringl to the drawings, 1 is the fram of the drill in the presentinstance, which can be supported in any suitable manner according to thetype of drill to which the invention is applied. This frame has abearing 2 for the shaft 3 which is provided with a handle, although apulley may be substituted for the handle when the drill is driven bypower. Secured to the inner end of the shaft 3 is a bevel gear wheel 4which meshes with a pinion 5 splined to the spindle 6. The spindle, inthe present instance, has a longitudinal groove therein and a key on thepinion enters the groove so that while the spindle can move verticallyin the pinion it must turn therewith.

7 is a bearing through which the spindle 6 extends. This bearing'restsupon the end of the pinion and has an extension forming an outer bearingfor the shaft 3, as clearly shown in Figs. 1 and 2. In this bearing is aspring bolt 8 having a handle 9. When in the position illustrated inFig. 2, this bolt is withdrawn clear of the groove in the spindle 6,but, when the handle 9 is shifted lfeed screw 10. The lower end of thefeed screw rests upon a bearing 11 secured to the spindle, so thatv thepressure of the spindle, as the tool enters the work, is taken 'by thisbearing. The upper end of the screw rests against a sliding bearing 12which is `held to the spindle by a screw 13 and washer 14. This bearingisadapted'to slide on the :vertical guide 15 which is mounted on thelupper portion of the frame 1 and has a stop -16 to' limit theupward'movement of the sliding bearing 12.

Secured to the feed screw 10 is a ratchet wheel 17, and mounted betweenthe end of the ratchet wheel and the bearing 12 `is a carrier 18 in'which is mounted a spring pawl `19. j This spring pawl is free to turnin the carrier, as illustrated in Fig. 4, so as to feed either to theright or to the left. In the carrier is a notch 20 lto receive thehandle 21 of the pawl so as to'hold the pawl` in either of the twopositions in which v it is adjusted.

Secured to or forming part of the frame 1 is a` shifter 22. `In thepresent instance,

this shifter is securedto the frame by a screw 23 and has a lowerprojection 24 and an upper projection 25. The lower projection is in thepath of the handle 21 of the pawl 19 when the pawl is descending, and

the projection 25 is in the path of the handle of the pawl when the pawlis ascending.

In order to cause thecarrier 18 to reciprocate, Iform an eccentric holein the carrier,

`as illustrated in Fig. 4, and mount a roller 26 in a recess in thespindle 6, which forms a'cam so that, as the spindle rotates,'thecarrier will be reciprocated; the carrier being pivotally mounted on apin 27 projecting from the bearing 12.

Figs. 7, 8 and 9 are diagrams. In Fig. 7,

comes in contact with the projection 24 and is shifted to the positionillustrated in Fig. 8, causing the arm to ride on the upper wall of thenotch 20 and withdrawing theV pawl from engagement with the ratchetwheel 17, stopping the longitudinal movement of the spindle but notinterfering with the rotation thereof. When it is wished to reverse theratchet movement, the handle 21 is turnedto the position illustrated inFig. 9, so that the, upper projection 25 of the shifterv 22 will be inthe path of the handle 2l and, by reversing the rotation of the drivinghandle, the movement ,of the spindle and screw will be reversed and theratchet feed will take place on theupward movement. When the handle 2lcomes in contact with the projection 25, it is' caused to rotate` on thelower wall of t-he notch 20 and the pawl 19 will be withdrawn from theratchet wheel. The spindle canthen berotatedwithout furthermovement ofthek feedA screw. By this construction vertical movement of the spindlein s either'V direction is limitedV and there is no (Topics of thispatent may be obtaincdif .j liability of the spindle, or the feed screw,

passing a, given point and jamming in the frame due to neglect oftheoperator.

,Iclaimr-f l.

1. .The combination in a drill, of a'frame;

ratchet wheel on the feed screw; a carrier; a spring pawlon the carrierfor operating the ratchet wheel; anvarmon the pawl for shifting it sothat it `will feed'either to the.-

e ltwo subscribing witnesses. a spindle; a feed screw von the'spindle;a? 'j right or to the left; a camon the spindle for actuating thecarrier; ashifter on the frame having upper and lower projections, loneat one side andthe other yon .the opposite side of the carrier and inthe path ofthe a'rm of the pawl, so that, when the feed screw reachesthe limit of its downward movement,

the pawl will be automatically moved out ofl engagement with the ratchetwheel and, when the screw reaches the limit of its upward movement, thepawl will beautomatically thrown out Lof engagement with the ment withthe ratchet wheel; and a shifter having an upper anda lower projection,one j on one side of the Vpawl and thev other on the opposite sidethereof and in the path' of 4t-he arml when it is in either of its twoeXtreme positions, so that, wheny the arm comes in Contact with one ofthe projections, the pawl will be thrown out of engagement with the:ratchet wheel. j l

ln testimony whereof, I haveA lsignedmy lname toqthisspeciication, inthe presence of. f

n 4 Geenen oqLEoroLD. Witnesses: y Y i A RUSSELLQGRAFFINS,

XVM. A. BARR.

or five cents each,l by addressing the Commissioner of PatentsWashington, D. C. i

' 'foL

